Process of producing durable solutions for spinning and other purposes.



' bohydrates. It

of Producing I ning and other Purposes, of which the folstances are UNITED sT -TEs PATENT OFFICE.

RUDOLPH 'LINKMEYER, oE RREMEN, GERMANY.

rRocEss or PRonucme' DURAIBLE SOLUTIONS-FOR srmmue AND OTHER ruRrosEs;

No Drawing.

Toall whom 'it may concern: s

Be it known that I, RUDOLPH LINKMEYER,

a subject of the German Empleror, and -reave invented proved Process- Spin-- siding at Bremen, Germany, a certain new and useful Im Durable Solut1ons for lowing is 'a specification.

In order to roduce durable ammoniacal copper oxidso utions of cellulose the applicant has proposed the incorporation of carhas 'now been. found that also other organic substances such as the alcohol's'of higher values and similar substances can be used with advantage for the same purpose. If one incorporates such in the properties is obtained. The same bears con--v siderably higher temperatures than a solu tion consisting of pure cellulose. stances can either be added'to the completed solutions or at any stage of dissolving the cellulose. The added subin either case dissolved and abhe finished solution thus permitthe production of most excellent spinsorb'ed byting ning solutions at much higher temperaturesthan was hitherto possible. One can use in identical manner besides the alcohols of. higher values also carbohydrates such as sugar and gums.

Example: 400

being diluted with water. of dextrin, cane su ar or mannite dissolved in water are adde This quantityof organic substances is tied up by the cupric hydrate which has been formed. In this solu- Then 20 grams tion one submerges 200 gr. of finely cut cotton fiber, separates by filter presses the'liquid from the pulp (the latternow The sub the process of.

' lose solution a I I ing. said alcohol inthe solution.

' 3. Process of producing solutions 'for grams of sulfate of copper dissolved in water are mixed with 240 00111. of caustic soda of 38 -B., the latter alsocontaining i the cupric hydrate together with the organic substances added) and then dissolves this pulp in 1000 ccm. of ammonia of 910 spec. weight. Simultaneously with adding the ammonia or soon after one may add further quantities-of organic substances mentioned heretofore. One may alsomix the dissolv ing agents first, then add the specific substances and finally the cellulose, method is less recommendable, as the thorough incorporation of the cupric hydrate into the cellulose appears essential for its speedy and complete solutlon. Perfec tly Specification of Letters Patent. Patented JuIie 2S. 1910. I. r Application filed June 23, 1909. Serial No. 503,890.

but this homogeneous solutions for the manufacture V p of artificial threads are thus obtained.

I now claim as my invention:

- 1. Process of producing solutions fo r spinning artificial threads' that will stand a ofh'eat, which comconsiderable amount prises forming a vcupro-ammonium cellulose solution and adding. thereto at'any one of the stages of its manufacture a higher alcohol and mamtaining said alcohol in the solution 2. Process of producing solutions" for forming artificial threads that will stand a considerable amountof heat, which comto a c'upro-ammomum celluprises adding higher alcohol and maintainforming artificial threads that will stand a considerable amount of heat, which comprises adding to a cupro-ammonium 'cellulose solution a'higher alcohol and a carbohydrate andrmaintaining said alcohol and carbohydrate in the solution.

In testimony whereof, I afiix my signature in the presence of two witnesses.- RUDOLPH LINKMEYER.

Witnesses:

FERDINAND Enron, PAUL MINoK. 

